Is the tail wagging the dog? Tonight we assess the claim that the Liberal Democrats are exercising too much control over the government on a whole range of issues. We talk to former US Secretary of State Colin Powell in the Bush administration about 9/11 and its impact. We have a film from Security correspondent Gordon Corera on the way NYPD and the FBI has responded to terror threats in the years after the attacks on New York and Washington and accusations that they have engaged in entrapment tactics. And we have an interview with Cathy Wilson about her time as the wife of the serial killer Peter Tobin.